#include<bits/stdc++.h>
#define ls (x << 1)
#define rs (x << 1 | 1)
#define ll long long
#define ull unsigned long long
using namespace std;

const int N = 1e6 + 10, INF = 0x3f3f3f3f;

int exgcd(int a, int b, int& x, int& y)
{
    if (b == 0) { x = 1, y = 0; return a; }
    int d = exgcd(b, a % b, y, x);
    y -= a / b * x;
    return d;
}

void solve()
{

}

int main()
{
    // ios::sync_with_stdio(0);
    // cin.tie(0);
    int T = 1;
    //cin>>T;
    for (int i = 1;i <= T;i++) {
        solve();
    }
}